DO YOU WANT TO VISIT ANAL FISSURE, ANAL FISTULA SPECIALIST IN KOTHRUD, WARJE, PUNE? BEST ANAL FISSURE, ANAL FISTULA SPECIALIST IN KOTHRUD, WARJE, PUNE? Dr Nitin Pawar is the Reliable and one of the Best Anal Fissure, Anal Fistula Treatment Specialist in Kothrud, Bavdhan, Warje, Sinhagad Road and entire Pune. Anal fissures are most commonly caused by damage to the lining of the anus or anal canal, the last part of the large intestine. Most cases occur in people who have constipation, when a particularly hard or large poo tears the lining of the anal canal. Other possible causes of anal fissures include: persistent diarrhoea. An anal fistula is an infected tunnel between the skin and the anus, the muscular opening at the end of the digestive tract. Most anal fistulas are the result of an infection in an anal gland that spreads to the skin. Symptoms include pain, swelling and discharge of blood or pus from the anus. Surgery is usually required to treat anal fistula.